Tiny means very small. Atoms are tiny. Hawaii is tiny, in comparison to the continental US. If you wear a size five shoe as an adult, you could be said to have tiny feet.
Throughout the world there are stories about tiny mythical heroes, such as Tom Thumb, a tiny baby, who grew into a tiny child then a man so tiny he was no larger than an average man's thumb. One of the things that people love about doll houses are seeing all the artifacts we live with day to day replicated in miniature, or tiny, form.